由... marks source/agency/origin means by/from/through depending on context and following structure.
Source/agent marker - indicates where/by whom something comes/occurs
Formal connective utility - common in written explanatory language
Structure-dependent interpretation - meaning determined by predicate frame
See examples below for varied real-world usage.
Clarify grammatical role of 由 phrase
- Agent, source, route, or cause depending on sentence.
Often appears in formal constructions
- Casual speech may use simpler alternatives.
Keep subsequent predicate compatible
- Avoid ambiguous attachment.
This case is handled by the legal department.
The result is derived from data.
The event is rescheduled from tomorrow to next week.
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